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Old 08-17-2022, 05:13 AM   #1
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A/C, Furnace control

2018 FR Salem Cruise Lite. Dometic AC and Suburban furnace. Set T stat to 'furnace' and both AC and furnace run together. It's a Dometic digital T stat.

Do I need to turn AC breaker off when I run the furnace?
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Old 08-17-2022, 07:24 AM   #2
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You shouldn't have to shut off any breakers. Are you positive that you don't have a heat pump? Has it worked properly before?
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Old 08-17-2022, 11:16 AM   #3
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Originally Posted by Beaglelvr View Post
2018 FR Salem Cruise Lite. Dometic AC and Suburban furnace. Set T stat to 'furnace' and both AC and furnace run together. It's a Dometic digital T stat.

Do I need to turn AC breaker off when I run the furnace?
Check your thermostat, and make sure the "fan mode" is in "auto". You do not need to turn the AC breaker off.
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Old 08-17-2022, 01:39 PM   #4
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As suggested....Fan set to Auto
Fan is for the A/C Unit
If not in Auto the Fan will run when furnace comes on. Idea is to 'circulate' warm air heated by furnace

In reality....Fan is noisy and cools the warm air

Check that Fan Mode setting on the thermostat
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